Muffler.



0. Z. FRAZER.

' MUFFLER. APPLIOATIOH FILED JAFLBI, 1913.

Patented. May 20, 1913.- x

2 SHEETS-SHEET a.

lwuemtoz Q Z Fraz1er MM humus 62M -3 ORVILLE Z. FRAZIER, OF ELKHART, INDIANA.

Specification of Letters Patent.

MUFFLER.

Patented May 20, 191-3.

Application filed January 31, 1913. Serial No. 745,458.

improvements in silencers and more particularlyt-o a mutiler for gas englnes and my object 1s to provide a device of this character which wiil be most effective incarry-' ing but the object for which thesame is des g'ned. I

A.further ob ect of the invention resides iii-providing a device-in which the exhaust gases may be permitted to expand in their course-through the mufiler, thereby prevent-- ing back pressure and a still further object resides in providing a mufiler composed of an outer casing in which there are arranged a plurality of -communicating chambers graduating in size.

Still another object of the invention resides in providing adevice which is simple and durable in construction, inexpensive to manufacture and one which will be very efiicient and useful inoperation.

,With hose and other objects in view, the invention consists in the novel features of construction, combination and arrangement of parts as will be hereinafter referred to and more particularly pointed out in the specification and claims. 7

In the accompanying drawings forming a part of this application, Figure 1 is a s de elevation of the device partly ,in section. Fig. 2 is a plan view of the same with the top removed and parts in section. Fig. 3 is a vertical transverse section therethrough as seen on line 33, Fig. 2. Fig. 4 is a vertical longitudinal section through the device.

In describing my invention, I shall refer to thedrawings in which similar reference characters designate corresponding parts throughout the several views and in which 1 indicates a housing or. casing, the lid or top 2 of which is removably secured thereto by means of bolts 3 and extending into the side walls of said housing or casing, are the branch discharge pipes 4, which lead to a main discharge 5. The inner face of the end wall. or head of said casing orhousing 1, has a portion thereof increased in thiclmess from its upper end to a point adjacent the posed outside of the same.

lower end thereof, as shown at 6, said increased portion having parallel side edges to provide shoulders on this end wall or head. Engaged with and secured to the lower and side edges of the increased portion 6, which are actually shoulders on' said end wall, are the side and bottom walls of an additional chamber 7, the side walls extending up to a plane parallel with the plane of the upper edges of the side andend walls of the casing 1. Secured to the opposite ends of the side and bottom walls of this chamber, is an end wall or head member 8 which is offset adjacent its edges to receive therein the ends of said side-and bottom walls. Threaded into the side, bottom and last mentioned end wall; of the chamber 7, are a plurality of discharge pipes 9 which have portions extending within said chamber and portions dis- The' outer face of the end wall 8 of the chamber 7 is also increased in thickness similar to the increased portion. 6 of the end Wall of the housing'l, and the shoulders formeghthereby receive thereagainst the side a"'d bottom walls of an additional chamber 10. An outer end wall 11 similar to the'wall 8 is secured to the side and bottom walls of said chamber 10 and the upper edges of the side .andend walls of this last mentioned chamber extend ,to the same horizontal plane as the upper edges of the chamber 7. This last mentioned chamber 10, of course, receives therein the ends of the discharge pipes 9 which extend through the end wall 8 hereabove referred to and also disposed through the end wall 11 and threaded therein are the additional discharge pipes 12, portions of which extend within, and portions beyond said chamber.

The outer face of the end wall 11 is also increased in thickness similar to the end wall 8, this increased portion extending to a point above the lower edge of the wall proper and engaged with the side and bottom edges of said increased portion are the bottom and side walls of an additional chamber 13. An end wall 14 is provided for this last mentioned chamber, through which extends theinlet pipe 15, the latter also extending through the adjacent end wall of the casing or'housing l. The chamber 13, therefore, receives therein the one end of the inlet pipe 15 and also the ends of the discharge pipes 12.- The upper edges of the side and end walls of the chamber 13, also extend to the same horizontal plane as the upper edges of the aforesaid chambers and thus it will be seen that said upper edges contact with the lid 2 when the latter is applied to the housing 1. It will, however, be

seen that the various chambers are gradu-' ated in size-and communicate with one another through the medium of the aforesaid discharge pipes.

In practice, the exhaust gases are conducted through the exhaust inlet pipel5 to the smallest chamber 13. As the gases expand therein, the same are conducted through the medium of the aforesaid pipes 12 into the larger chamber 10 wherein they are allowed to expand to a greater degree.

From this chamber the gases are conducted through the medium ofthe pipes 9 in the and end wall 8 to the still larger chamber 7,

wherein the gases are allowed to expand to.

the medium of this construction, the gases are allowed to expand gradually in the graduating chambers, thereby preventing back pressure and atthe same time all noise incident to the exhausting otgases from a gas enginewill be positively silenced.

From the foregoing it will be seen that I have provided a simple, inexpensive and 'efiicient meansfor carrying out the objects of the invention and while I have particularly described the elements best adapted to perform the functions set forth, it is obvious that various changes in form, proportion and in the minor details of construction may be resorted to without depart-ing from the spirit or sacrificing any of the principles of the invention.

.Having thus described this invention, what I claim is l. A muffler comprising a main casing, a

plurality of chambers arranged therein, said chambers being graduated in size and having the upper edges thereof in the same horizontal plane as the up er edges o'f-the side and end walls of said main casing, communicating means between said chambers and the main casing, means to supply exhaust gases to the smallest chamber, and discharge pipes leading from said main cas- 1 2. A mufller comprising a main casing, a plurality of graduating chambers arrange therein, said chambers being increased in size downwardly, the one end wall of'said casing forming the one end wall of the largest of saidchambers, and the one end wall of each of said chambers forming an end wall for each successive chamber, communieating means between said chambers and said main casing, means to supply exhaust gases to the smallest of said chambers, and discharge pipes leading from said'main casing. a v

In testimony whereoi l hereunto afiix my signature in the presence of two Witnesses.

'URVTLLLE Z. FRAZIER.

Witnesses FRANI; BRUMBAUGH, JERY sitizma. 

